Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc389c58ba68ab2391fc60510b1549c3f5d2a5c6b47f343ea989e441558d9f4' 
  AND token = '9fVzX4vnuzWI4jmfSFnxr54+CzXo+VgI/+Yr8Lj4WzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}